The Camille and Henry Dreyfus Foundation

550 Madison Avenue (formerly known as the Sony Tower, Sony Plaza, and AT&T Building) is a postmodern skyscraper at Madison Avenue between 55th and 56th Streets in the Midtown Manhattan neighborhood of New York City. Designed by Philip Johnson and John Burgee with associate architect Simmons Architects, the building was completed in 1984 as the headquarters of AT&T and later became the American headquarters of Sony. The building consists of a 647-foot-tall (197-meter), 37-story office tower with a facade made of pink granite. It originally had a four-story granite annex to the west, which was demolished and replaced with a shorter annex in 2020. At the base of the building is a large entrance arch facing east toward Madison Avenue, flanked by arcades with smaller flat arches. A pedestrian atrium, connecting 55th and 56th Streets midblock, was also included in the design, which enabled the building to rise higher without the use of setbacks. The ground-level lobby is surrounded by retail shops, which were originally an open arcade. The office stories are accessed from a sky lobby above the base. Atop the building is a broken pediment with a circular opening. The building has received much attention ever since its design was first announced in March 1978. The AT&T Building at 550 Madison Avenue was intended to replace 195 Broadway, the company's previous headquarters in Lower Manhattan. Following the breakup of the Bell System in 1982, near the building's completion, AT&T spun off its subsidiary companies. As a result, AT&T never occupied the entire building as it had originally intended. Sony leased the building in 1991, substantially renovated the base and interior, and acquired the structure from AT&T in 2002. Sony sold the building to the Chetrit Group in 2013 and leased back its offices there for three years. In 2016, the Olayan Group and Chelsfield purchased 550 Madison Avenue with plans to renovate it. 550 Madison Avenue was designated a city landmark by the New York City Landmarks Preservation Commission in 2018.

The Quilted Giraffe was a nouvelle cuisine fine dining establishment in Midtown Manhattan in New York City. The restaurant, founded by Barry Wine and his now ex-wife Susan, was first opened in New Paltz, New York, in 1975 and moved to 50th Street in Manhattan, New York City, in 1979. The Quilted Giraffe reopened in 550 Madison Avenue (then the AT&T Building) at 55th Street and Madison Avenue in 1987. The restaurant closed at the end of 1992 when Sony purchased the building and bought out the Wines' lease. The restaurant was designed by Woodson Rainey, AIA, of McDonough Rainey Architects. Regulars at the establishment included Warren Beatty, Woody Allen, Adnan Khashoggi, Ivan Boesky, Michael Milken, and John DeLorean and Cristina Ferrare.The restaurant was awarded four stars by New York Times food critic Marion Burros in 1984 and two additional times by New York Times food critic Bryan Miller.Among the chefs who worked under Wine at the restaurant and then went on to notable careers are Jan Birnbaum, Carmen González, David Kinch and Tom Colicchio.

The Friars Club is a private club in New York City. Famous for its risqué roasts, the club's membership is composed mostly of comedians and other celebrities. Founded in 1904, it is located at 57 East 55th Street, between Park Avenue and Madison Avenue, in the historic Martin Erdmann House (now known as the Monastery).

Aquavit is a Scandinavian restaurant located at 65 East 55th Street in Manhattan in New York City. In November 2016, an outpost was launched in London by Philip Hamilton.

Caviar Russe is a restaurant in New York City. The restaurant serves seafood and has received a Michelin star. There is a second location in Miami.

Le Pavillon was a New York City restaurant that defined French food in the United States from 1941 to 1966. The restaurant started as the Le Restaurant du Pavillon de France at the 1939 New York World's Fair run by Henri Soulé (1904–1966). When World War II began, Soulé and the Pavillon chef Pierre Franey stayed in the United States as war refugees. The restaurant formally opened on October 15, 1941, at 5 East 55th Street on Fifth Avenue, across the street from the St. Regis New York. In 1957, Le Pavillon moved to the Ritz Tower on Park Avenue and 57th Street. Soulé died in 1966, and Le Pavillon closed in 1971.In his autobiography, Jacques Pépin describes how he was first employed at Le Pavilion after emigrating to the US in 1959. He found that Franey and the rest of the staff were underpaid and treated poorly by Soulé, who insisted that he was barely making ends meet, even though he would offer complimentary meals and wine to a large number of celebrity guests. When Pépin and others organized a protest, he found himself physically threatened by organized-crime goons. However, there was soon an exodus of the staff (Franey and Pépin moved to Howard Johnson's) and the restaurant never recovered. Soulé's other faux pas was allowing paparazzi to disturb the Kennedy family (who were regular customers) and their staffers during John F. Kennedy's presidential campaign: when the Kennedy team, which was dining at the restaurant, asked the paparazzi to leave, Soulé insisted that only he had the right, as owner, to determine who entered and left the restaurant, and stated that, even before the election, "the Kennedys already think they are running the country." (Pépin was offered the job of White House chef after the election, but declined.) Daniel Boulud opened a restaurant with the same name in 2021, in homage to Soulé's restaurant.

Park Avenue Tower (also 65 East 55th Street) is a building on Park Avenue, between 55th Street and 56th Street, in Midtown Manhattan, New York City. The office building developed by Park Tower Realty opened in 1986 and has a height of 561 feet (171 metres). Park Avenue Tower has 36 floors, which can be reached with seventeen elevators. Designed by Murphy/Jahn Architects in postmodern style, Park Avenue Tower is made of stone, steel and glass. The floor plan of the building is a square with flattened corners and the tower narrows as it increases in height. There is a pyramid-shaped structure on the roof of the building that is not visible from the street.In front of the Park Avenue Tower main entrance on 55th Street is a Privately Owned Public Space with six polished granite planters. The building can be accessed through four entrances, one on 56th Street and three on 55th Street. The entrance on 56th Street and the middle entrance on 55th Street lead to the multi-story lobby. The walls of the lobby are made of granite and marble. The east entrance on 55th Street used to lead to the office of law firm Paul Hastings, which had an area of 23,500 m2 (252,951.9 sq ft) and was spread over sixteen floors., though Paul Hastings has since relocated to the MetLife Building. The fourth entrance leads to Restaurant Aquavit, a restaurant with two Michelin stars.

Saurien is a 1975, 18-foot (5.5 m) tall bright red sculpture by Alexander Calder, installed in Manhattan, New York.The statue is located in front of 590 Madison Avenue at the corner of East 57th Street and Madison Avenue.

432 Park Avenue is a residential skyscraper at 57th Street and Park Avenue in Midtown Manhattan in New York City, overlooking Central Park. The 1,396-foot-tall (425.5 m) tower was developed by CIM Group and Harry B. Macklowe and designed by Rafael Viñoly. A part of Billionaires' Row, 432 Park Avenue has some of the most expensive residences in the city, with the median unit selling for tens of millions of dollars. At the time of its completion, 432 Park Avenue was the third-tallest building in the United States and the tallest residential building in the world. As of 2022, it is the sixth-tallest building in the United States, the fifth-tallest building in New York City, and the third-tallest residential building in the world. 432 Park Avenue has 84 numbered stories and a mezzanine above ground. The tower's exterior is a lattice of poured-in-place concrete made from white Portland cement. The tower is segmented into 12-story blocks separated by open double-story mechanical spaces that allow wind gusts to pass through the building. It features 125 condominiums and amenities such as a private restaurant for residents. The skyscraper has received mixed reviews from both professionals and the public, with commentary about both its slenderness and its symbolism as a residence for the ultra-wealthy. 432 Park Avenue is located on the site of the former Drake Hotel, which was sold to Macklowe in 2006. The project faced delays for five years because of lack of financing as well as difficulties in acquiring the properties on the site. Construction plans were approved for 432 Park Avenue in 2011 and excavations began the next year. Sales within 432 Park Avenue were launched in 2013; the building topped out during October 2014 and was officially completed in 2015. After the building's completion, residents complained of mechanical and structural problems, leading to a lawsuit in late 2021.

19 East 54th Street, originally the Minnie E. Young House, is a commercial building in the Midtown Manhattan neighborhood of New York City. It is along 54th Street's northern sidewalk between Madison Avenue and Fifth Avenue. The building was designed by Philip Hiss and H. Hobart Weekes of the firm Hiss and Weekes. It was constructed between 1899 and 1900 as a private residence for Minnie Edith Arents Young. The house was designed as a palazzo in the Italian Renaissance Revival style. The 54th Street facade was designed as a four-story structure with a rusticated first story and decorated windows on the upper stories. Because 19 East 54th Street was wider than other houses in the area, the architectural details were designed to be more imposing. The penthouse at the fifth and sixth stories is recessed from the street. The interior was ornately outfitted with a coffered ceiling, a stained-glass conservatory, and staircases with oak paneling. Young commissioned the house after her uncle Lewis Ginter, the founder of the American Tobacco Company, died in 1897 and left her a large bequest. Young leased the home to "Lucille" Lady Duff Gordon in 1920. The house was subsequently occupied by antiques trader Arthur S. Vernay from 1925 to 1943, then by the English-Speaking Union until 1956. Hairdresser Mr. Kenneth operated a salon in the building from 1963 until 1990, when the house's interior was severely damaged by fire. The building was then renovated and has served as Bank Audi's U.S. headquarters since 1993. The New York City Landmarks Preservation Commission designated 19 East 54th Street as an official landmark in 2016.

The Bignou Gallery was a New York City gallery located in Midtown Manhattan. It was a branch of the Bignou Gallery in Paris. The Bignou Gallery exhibited works by major European and American artists including Paul Gauguin, Georges Gimel, Henri Matisse, Jean Lurçat, and Amedeo Modigliani.

The Weylin Hotel was a hotel at 527 - 531 Madison Avenue and 40 - 54 East 54th Street in New York City. It was on the southeast corner of 54th Street. The structure was sixteen stories tall and opened in March 1921. The building fronted sixty-one feet on Madison Avenue and one hundred forty-eight feet on 54th Street. It contained 125,000 square feet (11,600 m2) of space.